Locals know it simply as the mass rock, a name that points to one of the more quietly charged categories of place in Irish history. Mass rocks were outdoor altars, typically natural stone surfaces, used by Catholic communities during the Penal era, roughly the late seventeenth and early eighteenth centuries, when the public practice of Catholicism was suppressed under a series of laws that banned priests from celebrating Mass in any formal setting. Congregations gathered in remote fields, on hillsides, or along hollow roads, with the rock serving as the priest's altar and lookouts posted to watch for authorities.

The Kilnameela example, located in West Cork, is recorded simply as a rock outcrop in a field of pasture, identified locally by the name that marks its function. West Cork has a notable concentration of such sites, reflecting both the density of Catholic rural communities in the region and the enforcement of Penal laws that pushed worship into the open countryside. The designation CMSS, used in the Cork archaeological record, refers to the category of commemorative and social sites, grouping mass rocks alongside other places defined less by physical construction than by collective memory and use. What stands here is not built or shaped; its significance is entirely in how it was used and in the name it has carried ever since.